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1 tháng 12 2023

Ta có : \(\left\{{}\begin{matrix}2x=3y\\4y=3z\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}\dfrac{x}{3}=\dfrac{y}{2}\Rightarrow\dfrac{x}{9}=\dfrac{y}{6}\\\dfrac{y}{3}=\dfrac{z}{4}\Rightarrow\dfrac{y}{6}=\dfrac{z}{8}\end{matrix}\right.\)

`=> x/9 =y/6 =z/8=>x/9 =y/6 = (2z)/16` và `x-y+2z=57`

ADTC dãy tỉ số bằng nhau ta có :

`x/9 =y/6 = (2z)/16 = (x-y+2z)/(9-6+16) = 57/19=3`

\(\Rightarrow\left\{{}\begin{matrix}\dfrac{x}{9}=3\Rightarrow x=3\cdot9=27\\\dfrac{y}{6}=3\Rightarrow y=3\cdot6=18\\\dfrac{z}{8}=3\Rightarrow z=3\cdot8=24\end{matrix}\right.\)

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1 tháng 12 2023

1\

 

 

1 tháng 12 2023

1. fish

2. furniture

3. Physics

4. knowledge

5. umbrellas

6. trees

7. rice

8. milk

1 tháng 12 2023

1 fish

2 furniture

3 Physics 

4 knowledge

5 umbrellas

6 trees

7 rice

8 milk

1 tháng 12 2023

Sửa lại: Vật phát ra âm cao khi tần số dao động lớn hơn.

1 tháng 12 2023

loading... a) Ta có:

∠xOy + ∠yOz = 150⁰

∠xOy - ∠yOz = 90⁰

⇒ ∠xOy = (150⁰ + 90⁰) : 2 = 120⁰

⇒ ∠yOz = 120⁰ - 90⁰ = 30⁰

b) Ta có:

∠xOy + ∠x'Oy = 180⁰ (kề bù)

⇒ ∠x'Oy = 180⁰ - ∠xOy

= 180⁰ - 120⁰

= 60⁰

21 tháng 8

xoy=(150+90):2=120

yoz=120-90=30

 

1 tháng 12 2023

√0,81.(√x - 16/25) = 9/10

0,9.(√x - 16/25) = 9/10

√x - 16/25 = 9/10 : 0,9

√x - 16/25 = 1

√x = 1 + 16/25

√x = 41/25

x = 1681/625 (nhận)

Vậy x = 1681/625

loading... 

1
D
datcoder
CTVVIP
1 tháng 12 2023

\(\sqrt{0,81}\left(\sqrt{x}-\dfrac{16}{25}\right)=\dfrac{9}{10}\left(x\ge0\right)\\ \Leftrightarrow\sqrt{\dfrac{81}{100}}.\left(\sqrt{x}-\dfrac{16}{25}\right)=\dfrac{9}{10}\\ \Leftrightarrow\dfrac{\sqrt{81}}{\sqrt{100}}.\left(\sqrt{x}-\dfrac{16}{25}\right)=\dfrac{9}{10}\\ \Leftrightarrow\dfrac{9}{10}.\left(\sqrt{x}-\dfrac{16}{25}\right)=\dfrac{9}{10}\\ \Leftrightarrow\sqrt{x}-\dfrac{16}{25}=1\\ \Leftrightarrow\sqrt{x}=\dfrac{41}{25}\\ \Leftrightarrow x=\dfrac{1681}{625}\)

Vậy x = \(\dfrac{1681}{625}\)

A researcher has made a report that says “having a lot of money makes you a bad person”. Professor Paul Piff spent ten years looking at the personalities of rich people and found that their behaviour was very different to the behaviour of poor people. Dr Paul Piff said rich people are more likely to break rules, not follow the law, and not care about other people. He also said wealthy people cheat more at games and are less likely to help other people. Professor Paul Piff told the BBC that:...
Đọc tiếp

A researcher has made a report that says “having a lot of money makes you a bad person”. Professor Paul Piff spent ten years looking at the personalities of rich people and found that their behaviour was very different to the behaviour of poor people. Dr Paul Piff said rich people are more likely to break rules, not follow the law, and not care about other people. He also said wealthy people cheat more at games and are less likely to help other people. Professor Paul Piff told the BBC that: "Wealth makes you more worried about your own interests, your own desires, your own welfare." He added that rich people think their own goals and needs are the most important things in their life.
Professor Paul Piff also found that poorer people are much more generous than rich people. The poor give a higher percentage of their money to help the others than the rich. He said poorer people give one – and – a – half times as much as richer people. He said: "The wealthier you are, the less generous you are. You give significantly smaller portions away to other people." However, he did say that rich people could change their behaviour and become nicer and more generous. He said rich people can help others more if you tell them that giving and helping is a good thing. He said: "Reminding people of the benefits of cooperation, or the advantages of community, causes wealthier individuals to be just as giving as poor people."

1. What is the main aim of the writer in writing this text?   A. Make the difference in the behaviour between the rich and the poor B. Remind the people about the benefits of giving and helping C. Encourage the poor to give more D. Criticise the rich for not helping the others 2. What is not true that Dr Piff said about the rich?   A. They are more likely to break rules. B. They don't follow the law. C. They treat the poor so badly. D. They don't care about the others. 3. According to Dr Piff, what is the most important thing for the rich?   A. Interests B. Desires C. Welfare D. Goals and needs 4. What do poorer people give more than richer people?   A. Money B. Food C. Clothes D. Time 5. How can richer people become nicer and more generous?   A. By earning more money B. By cheating more in games C. By giving and helping more D. By working harder
2
30 tháng 11 2023

giúp mik với mik đang cần gấp

 

2 tháng 12 2023

Bạn xem lại đề bị lỗi 

A researcher has made a report that says “having a lot of money makes you a bad person”. Professor Paul Piff spent ten years looking at the personalities of rich people and found that their behaviour was very different to the behaviour of poor people. Dr Paul Piff said rich people are more likely to break rules, not follow the law, and not care about other people. He also said wealthy people cheat more at games and are less likely to help other people. Professor Paul Piff told the BBC that:...
Đọc tiếp

A researcher has made a report that says “having a lot of money makes you a bad person”. Professor Paul Piff spent ten years looking at the personalities of rich people and found that their behaviour was very different to the behaviour of poor people. Dr Paul Piff said rich people are more likely to break rules, not follow the law, and not care about other people. He also said wealthy people cheat more at games and are less likely to help other people. Professor Paul Piff told the BBC that: "Wealth makes you more worried about your own interests, your own desires, your own welfare." He added that rich people think their own goals and needs are the most important things in their life.
Professor Paul Piff also found that poorer people are much more generous than rich people. The poor give a higher percentage of their money to help the others than the rich. He said poorer people give one – and – a – half times as much as richer people. He said: "The wealthier you are, the less generous you are. You give significantly smaller portions away to other people." However, he did say that rich people could change their behaviour and become nicer and more generous. He said rich people can help others more if you tell them that giving and helping is a good thing. He said: "Reminding people of the benefits of cooperation, or the advantages of community, causes wealthier individuals to be just as giving as poor people."

1. What is the main aim of the writer in writing this text?   A. Make the difference in the behaviour between the rich and the poor B. Remind the people about the benefits of giving and helping C. Encourage the poor to give more D. Criticise the rich for not helping the others 2. What is not true that Dr Piff said about the rich?   A. They are more likely to break rules. B. They don't follow the law. C. They treat the poor so badly. D. They don't care about the others. 3. According to Dr Piff, what is the most important thing for the rich?   A. Interests B. Desires C. Welfare D. Goals and needs 4. What do poorer people give more than richer people?   A. Money B. Food C. Clothes D. Time 5. How can richer people become nicer and more generous?   A. By earning more money B. By cheating more in games C. By giving and helping more D. By working harder
1
30 tháng 11 2023

giúp mik với mik cần gấp!

 

4 tháng 12 2023

M H K P Q I O

a/ Xét tg MKP và tg MHQ có

\(MP=MH\left(gt\right);MK=MQ\left(gt\right)\) (1)

\(\widehat{KMP}=\widehat{HMP}+\widehat{HMK}=90^o+\widehat{HMK}\)

\(\widehat{HMQ}=\widehat{KMQ}+\widehat{HMK}=90^o+\widehat{HMK}\)

\(\Rightarrow\widehat{KMP}=\widehat{HMQ}\) (2)

Từ (1) và (2) => tg MKP = tg MHQ => PK=HQ

b/

Xét tg vuông HMP có

\(\widehat{MPH}+\widehat{MHP}=90^o\)

\(\Rightarrow\widehat{MPK}+\widehat{HPK}+\widehat{MHP}=90^o\)

Ta có

tg MKP = tg MHQ (cmt) \(\Rightarrow\widehat{MPK}=\widehat{MHQ}\)

\(\Rightarrow\widehat{MHQ}+\widehat{HPK}+\widehat{MHP}=90^o\)

\(\Rightarrow\left(\widehat{MHQ}+\widehat{MHP}\right)+\widehat{HPK}=90^o\)

\(\Rightarrow\widehat{PHQ}+\widehat{HPK}=90^o\)

Xét tg HPI có

\(\widehat{PHQ}+\widehat{HPK}=90^o\left(cmt\right)\Rightarrow\widehat{HIP}=90^o\Rightarrow PK\perp HQ\)

c/